Four issues in one pass:
1. Move snaps to grid
MoveOverlay's cursor is now snapped via snapPointToGrid([m.x, m.y],
GRID_STEP=0.5). Matches the 3D shelf tool's placement step so 2D
and 3D placement feel identical.
2. Move translates the actual rendered SVG, not a ghost
MoveOverlay no longer portals a 50%-opacity ghost. Instead it finds
the rendered [data-node-id] <g> inside the floor-plan scene and sets
its `transform` attribute imperatively each pointermove. The inner
group's translate(px pz) rotate(deg) stays untouched — the outer
transform composes as a pure delta. Same "smooth move" pattern as
the 3D MoveRegistryNodeTool: no React re-renders, no zundo bloat,
the actual shape follows the cursor with full fidelity.
3. Click commits the position (previously did nothing)
Switched from `window click` (with capture + composedPath check)
to `window pointerup`. Pointerup fires reliably regardless of
click-vs-drag semantics in the floor-plan panel's pointer-down
handlers (which can preventDefault on certain modes and suppress
the synthesized click). Target check uses
`target.closest('[data-floorplan-scene]')` instead of composedPath
for cross-browser SVG reliability.
4. Clicking in floor plan with shelf tool active creates a shelf
Root cause: `isFloorplanGridInteractionActive` is a hardcoded OR of
build/move modes that doesn't include registry kinds, so the panel
never emits `grid:click` / `grid:move` for them. Shelf tool listens
on those events; without them, clicks were silently dropped.
Fix: new `isRegistryToolBuildActive` derived from
`mode === 'build' && tool != null && nodeRegistry.has(tool)` — added
to the OR chain. Future Phase 5 kinds (fence, item, etc.) inherit
floor-plan placement automatically the moment they register a tool.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
